user variables in SOLVE

[compsystems]

There is a conflict within the applications and external definitions from HOME or CAS. when defining A, B, ... X, Y, ... as 0, in some cases the results are not as expected. I think the only solution to avoid this problem is the one made by the classpad calculator, that is, to leave the variables A, B, ... X, Y, ... free, and use some alternatives A, B, ... X, in bold as user variables



example of the conflict of variables
http://www.hpmuseum.org/forum/thread-10494.html